Chapter 6 Ai Flashcards
(21 cards)
What happens when you bend your knees upon landing?
The extension of time during your momentum decrease reduces the force on you.
True or False: When a dish falls, the change in momentum is less if it lands on a carpet than on a hard floor.
False.
What is the law of conservation of momentum?
In the absence of an external force, the momentum of a system remains unchanged.
What occurs during an elastic collision?
Colliding objects rebound without lasting deformation or generation of heat.
What occurs during an inelastic collision?
Colliding objects result in deformation and/or the generation of heat.
In a collision, what is the relationship between net momentum before and after the collision?
Net momentum before collision equals net momentum after collision.
What happens to the speed of two coupled freight cars compared to the initial speed of the moving freight car?
The speed of the coupled freight cars is half the initial speed of the moving freight car.
What is momentum?
A property of moving things, specifically mass multiplied by velocity.
Fill in the blank: Momentum = _______.
Mass x Velocity.
What is impulse?
The product of force and time (force x time).
What happens to impulse when the force that produces it acts for twice as much time?
The impulse is doubled.
What does a moving object has? (3)
energy, speed, and momentum
What is the effect of a longer cannon barrel on the speed of a cannonball?
The cannonball emerges with greater speed due to greater impulse.
How do internal molecular forces within a baseball affect its momentum?
They cancel one another out and have no effect on the momentum of the ball.
What is a ‘double impulse’?
Occurs when something bounces, providing an additional impulse.
When the speed of an object is doubled, what happens to its momentum?
Its momentum doubles.
What is the relationship between impulse and change in momentum?
The greater the impulse exerted, the greater the change in momentum.
What is the formula for impulse?
Impulse = Ft.
What does ‘momentum in motion’ refer to?
Kinetic energy.
What happens when you push with the same force for twice the time?
You impart twice the impulse and produce twice the change in momentum.
A fast-moving car hitting a haystack or hitting a cement
wall produces vastly different results.
1.Do both experience the same change in
momentum?
2.Do both experience the same impulse?
3.Do both experience the same force?
A. Yes for all three
B. Yes for 1 and 2
C. No for all three
D. No for 1 and 2
B. Yes for 1 and 2
